Furthermore, tritium has a 12.3-year half-life and requires replacement as part of stockpile stewardship. This technical challenge is somewhat addressed in modern weapons that use solid lithium deuteride as fuel in place of some of the tritium: neutrons interact with the lithium-6 and create tritium in situ [1]}, [2]}. The current treatment of lithium, which can be commonly procured with no known risk to common defense and security, supports an appropriately low level of concern with vertical proliferation triggers.
